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*   Copyright (c) 2010, Pierre Favier
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using System;
using NTasking.ValidationTests.ACATS_3_0.Support;
using NUnit.Framework;
using Rhino.Mocks;

namespace NTasking.ValidationTests.ACATS_3_0.C9
{

    [TestFixture(Description = "")]
    public class C9740008 : ValidationTest
    {

        private static int Count = 1234;
        private static bool TriggeringStatementCompleted = false;


        internal enum KeyEnum
        {
            None,
            Cancel,
            Deposit,
            Withdraw
        }


        internal class ATMCardType
        {
            public int Number { get; set; }
            public int Pin { get; set; }
        }


        internal class TransactioCancelled : Exception {}


        internal class ATMKeybordTask : Task
        {

            [Entry]
            internal Action CancelPressed { get; private set; }


            protected override void Body()
            {
                KeyEnum keyPressed = KeyEnum.None;

                keyPressed = ListenForInput();

                Accept(CancelPressed, () =>
                {
                    TriggeringStatementCompleted = true;
                });
            }


            private KeyEnum ListenForInput()
            {
                // Simulate the situation where the user presses the cancel key
                // before the card is validated

                // press the cancel key immediately
                return KeyEnum.Cancel;
            }

        }


        private static void ReadCard(ATMCardType card)
        {
            card.Number = 9999;
            card.Pin = 111;
        }


        private static void PerformTransaction(ATMCardType card, IValidationTestResult result)
        {
            // Triggering alternative sequence of statements
            // not executed
            result.TestFailed();

            if (!TriggeringStatementCompleted)
                // Triggering statement did not complete
                result.TestFailed();
        }


        [Test(Description =
            "Check that the abortable part of an asynchronous select statement" +
            "is aborted if it does not complete before the triggering statement" +
            "completes, where the triggering statement is a  task entry call, and" +
            "the entry call is queued." +
            "\n" +
            "Check that the sequence of statements of the triggering alternative" +
            "is executed after the abortable part is left.")]
        public void Test()
        {
            IValidationTestResult result = Mocks.DynamicMock<IValidationTestResult>();

            ATMKeybordTask keyboard = null;
            ATMCardType card = new ATMCardType();

            ReadCard(card);

            Ada.Declare(() =>
            {
                keyboard = new ATMKeybordTask();

                // Setup test expectations

                Expect.Call(result.TestFailed).Repeat.Never();

                Mocks.ReplayAll();
            },
            Begin: () =>
            {
                // Start test execution

                // Ensure task is waiting at the accept
                // This is the time required to activate another task and allow it
                // to run to its first accept statement.
                Ada.Delay(Impdef.SwitchToNewTask);

                //
                // Asynchronous select is tested here
                //

                // Entry call is executed immediately
                keyboard.CancelPressed.Select(() =>
                {
                    // This is executed after ValidateCard
                    // is aborted.
                    throw new TransactioCancelled();
                }).
                ThenAbort(() =>
                {
                    // In other similar tests Validate_Card is called here.  In this 
                    // test we just check to see if the abortable part is called at
                    // all.  Since the triggering call is not queued the abortable 
                    // part should not be started
                    //
                    result.TestFailed();
                });

                // Should not be reached.
                PerformTransaction(card, result);
            },
            Exception: (ex) =>
            {
                if (ex is TransactioCancelled)
                {
                    if (!TriggeringStatementCompleted)
                        // Triggering alternative sequence of statements
                        // executed but triggering statement not complete
                        result.TestFailed();

                    return false;
                }

                return true;
            });

        }

    }

}
